400 



C. CALLAWAY 029" THE NEWE3 GNEISSIC 



thrown side of the syncline ; so that they have been broken off and 

 pushed to the west onto the Dolomite. The whole of the uninverted 

 dolomite is obviously crashed out, except the few feet west of the 

 little bay. 



The road-section, at a level which rises from 60 ft. on the east to 

 140 ft. on the west, confirms and illustrates the last. The overthrown 

 Annelidian Quartzite at the east end is contorted for a few feet, and 

 is then succeeded by Brown Flags and Salterella-grit in nearly 

 vertical beds. These are the strata which abut downwards onto 

 the Dolomite. We then pass an interval of 130 paces occupied by 

 debris, obviously masking the centre of the crush. Then we reach 

 the anticline. Being at a higher level, we are chiefly in the 

 Salterella-grit and Dolomite ; but at the west end we come onto the 

 Flags, where they begin to bend to the south-west. The arch is more 

 complicated than at the shore, the beds being puckered into two or 

 three subsidiary curves. This is what we should expect from the 

 closer proximity of the strata to the centre of the fold. The facts 

 seen at the east end of this and the last section indicate that the 

 folding-back is complicated by a reversed fault. 



It will be convenient to take the ridge-section from W. to E. 

 The ground rises from 140 ft. to about 600 ft. Leaving the road, 

 we pass over dolomite dipping easterly, forming the eastern side of 

 the arch and, of course, the western side of the fold. Higher up 

 the dip rises, reaches the vertical, then changes to westerly at 80°. 

 We are here apparently in the focus of the crush. Close by to the 

 east (350 ft.) is a slight hollow ; and beyond it are the Salterella- 

 grit, Brown Flags, and Annelidian Quartzite in regular sequence. 

 The beds vary between an easterly dip at 80° and the vertical. This 

 succession is precisely the same in lithology and thickness of beds 

 as the arch-like section on the shore, but in reversed order, and it 

 clearly constitutes the eastern limb of the synclinal fold. The 

 Seamy Quartzite is found underlying the Annelidian higher up the 

 hill. Following these quartzites along the strike to the north, we 

 find they are continuous with the overthrown quartzite of Druim-an- 

 tenigh ; so that the overthrow is proved both by actual observation 

 of the gradual change of dip and by the reversed order of the 

 succession. 



This folding-back of the Quartzite and associated beds is seen 

 very clearly all along the ridge from the Arnaboll valley to the line 

 of the present section. Leaving the Eastern Gneiss, and descending 

 the slope to the loch, we everywhere find that the quartzite, after 

 a few sharp overthrown contortions, bends over to the west, and 

 plunges down in vertical sheets, which, as we follow them down- 

 wards, gradually bend into the hill, so as to present an over- 

 hanging surface to the west. 



These sections render intelligible the otherwise obscure ground 

 between Druim-an-tenigh and Heilem Ferry. The peninsula. at the 

 ferry is composed of the Dolomite, dipping at a low angle to E.S.E., 

 as if it would pass below the quartzite of Druim-an-tenigh. There 

 is no reasonable doubt that this dolomite is continuous with the 



